Arabians, as a whole, do the best; but there are individuals from many breeds
who can excell. Not all Arabians make ideal endurance mounts. Whichever
breed you choose, you have to be picky. Pick a horse that is muscled like a
distance runner, not a weight lifter. Refer to the AERC - Endurance Riders
Handbook for guidelines in picking an endurance horse, as well as information
on conditioning, competing, feeding, and several other subjects concerning
endurance. For more information search the archives of Ridecamp and read
Getting Started on endurance.net.